Typewriting machine



" Sept. 20 1927.

- G. AICHELE TYPEWRITING MACHINE Filed Oct. 19. 1926 BY MAM/M4K PatentedSept'. 20, 1927.'

uNi'ran .STATES 4Muir.ISJT oFFicE.

GorrLoB AICHELE, oE NELLINGEN' NEAR ESSLINGEN, ."GEniiiAN'm nssieNon, BYMESNE ASSIGNMENTS., 'ro DAIMLER-BENZ AKTIENGEsELLscirAE'r, or BERLIN,cna,

MANY.

TYPEWRI'TING MACHINE.

Application led October 19, 1926, Serial No. 142,735, andv in GermanyMarchl 27, 1924.

This invention comprises improvements in and connected withreversibleribbon feding mechanisms for typewriting and hke machines andis concerned with mechanisms lof the type in which the reversal of theribf4 .bon feed vis initiated by a pin arranged in the hollow verticalspindle of a bobbin and which is permitted to fall or move axially uponthe unwinding of `the ribbon from that bobbiwmfV vThe object of theinvention is to' attain elements as' yare liable to derangement.

According to this invention, a lever, oscillated by the bobbin drivecommunicates osci'llatory movement through a rod arrangement to a secondlever which operates upon tongs-like feed levers, the axially movablepin in the bobbin being adapted, When released, to so modify theoscillation of the second lever as to bring about an operativeengagement of the feed levers of the empty bobbin and a disengagementofthe feed levers of the full bobbin, the said feed levers being engagedor disengaged by closing movement towards one another or by openingmovement away from one another, as

the case may he.

The driving lever and the second or reversing lever of each bobbin arepreferably arranged to oscillate aboutfa common pivot and the rodconnection between the reversing levers is advantageously mountedslidably within a bore of the rod which transmits the motion from onevdriving lever to the other. i

The mechanism in accordance with this invention is distinguished by theemployment of a comparatively small numbercf veryv simple parts, withavoidance, as far-as vpos'- sible, of cranks. The mechanism also'isdistinguished by parts moving inthe same plane 5 kor in parallelplanes,. as far as possible,

whereby bending or distortion ofthe small.4 parts functioning in thetransmission 1s pre-1 vented.

In order to enable they invention to be readily understood, reference ismade to the accompanying drawing illustrating one embodiment of theinvention by way o-f example, in which drawing Figure 1 is a view frombelow of a re-V .reversal from the position seen in Figure 1.

12. Toothed rack levers 21 and 22 are versible ribbon feed mechanismembodying the invention showing the parts in the position for windingon'by the left hand spool and unwinding by the right hand spool.

Figure -2 is a view of the mechanism after Figure 3 is a sectional sideelevation of Figure 1.

Figure 4 is a vertical section 'through one of the spools and itsassociate parts.

Referring tothe drawings, 1 is a cover plate with housings 2,3,l for thespools, lthe spool pivots or spindles 4` bein mountedl central y withinthe housings. Ihe spools 5 are mounted on their'spindles 4 in knownmanner bein secured vby knurled nuts 6, for example. T e lefthandbobbin5 is adapted for being driven by a spring througha mechanism which actsupon the bevel wheel 7. The last named is mounted upon the spindle part8 of the cam 9 which is arranged in a 'bearing bracket 10. A pin orroller 11 on the lever 12 engages with the cam 9 lfor oscillating thelever 12 about the pivot 13,- the end of the lever 12 being shaped forreceiving` guidance in the guide 14 of the bearing braclret 10. An arm15 of the lever 12 engages in an aperture in an extension at kone end ofa hollow. rod 16, as will be readif ly understood by comparing Figures 1and 3,

an extension at the opposite end of the rod 16 being similarly -engagedwith an arm of a lever 17 corresponding with the lever 12, 15. The lever17 oscillates about apivot 18 Vmounted in the bobbin housing 3. The end19 of thek lever 17 is guided in a-recess 20 90` corresponding with theguide 14 of the lever 1v. otally mounted on. the leverf12 atvtliepolfnts 23,024, and 'their' free ends are connected together by a spring25 which constantly tends to bring vthe levers together and hold themagainst opposite points of the toothed wheel 26 on the left hand spoolspindle 4. Toothed rack levers 27 and 28 are pivotally mounted at 29, 30on the lever 17, the free ends of these levers being connected togetherby a spring 31 constantly tending to hold them in mesh withl oppositepoints of the toothed wheel'32 on the spindle of the right hand spool. f

In Figure y1 it is assumed that the spool in the housing 2 is winding onand that the spool'in the. housing 3 is unwmding. In

operation,

wheel 7 and Vthe lever 12 is oscillated owing the cam 9;.is driven bythe Ibevel to the engagement with the cam 9 of the pin or roller 11. Therack levers 21 and 22 mesh with the toothed wheel 26 .owing to theaction of the spring 25, the wheel 26 being of the ratchet type and theteeth ofv the levers 21 and 22 being directed so that.

on one swing the teeth of the lever 22 slip, the reverse being the caseon the opposite swing.' Continuous' motion is thus imparted to the spoolspindle and being uniform owing to the heart-shape. 'of the cam 9.Meanwhile, the rack levers v27,l 28 of the other-spool are out ofengagement with the wheel 32 as seen in Figure 1, being spread apart bya mechanism hereinafter described, but they move .to and fro with thelever 12 and rack levers 21. and 22'owing to the rod 16 'connectingtogether the levers 12 and 17. This operation continues. and the lefthand spool continues to wind on and the right hand s ool'continues tounwind under the pull of di 33 which drops under its own weight, a pro--lower end'of the pin or rod 33;-.

jection on the then. enteringla slot 37 formed 1n an enlarged art 38 onte end of a reversing lever 39.

ne lever 39 is mounted on the pivot 13 in association .with the lever 12and another lever39 is mounted on theipivot -18 in association with theleverI 17. VThe upper ends 40 of the levers 39 are engaged by pm andfork engagement 'with-the extended of the hollow rod 16.* Theenlargements 38 of the levers ,39' are tted with pins 43 formed edges`:on end 4adapted' for engaging suitably inclined and rack levers 21,`22vand 27 28. 'Figure 1,

' the pin 43 of the left gether by the spring hand `lever 39.1'iso outof engagement with the consequence that` the rack levers 21, 22 arefreet'o be pulled to- 25 so that -they are :ff held in mesh with theratchet .26. The

` wheel 32.

pin 43 of the right hand lever 39, however, is seen to be-Qin engagementwith the appropriate parts of the rack levers 27, 2 8, so that theselevers are spread. .and their `rack teeth fail to mesh with `the ratchetWhilst either vof therspools retans any coils of ribbon, the lever .arms36 are prevented from projecting by such coils spool, the motionl 17,each of thelever's- 39 having been in e ribbon until the latterspoo'lvis empty when the reversal takes place as ends of' a rod41.'slidably mounted within the bore enlargements of the any hindrancevto the' free swinging and working ofthe parts. l As soon as the righthand spool becomes empty its lever arm 36 is free to move out throughthe slot as above and lever 39. This effects an arrest of the right handvlever 39 in its swinging motion which hasup till this moment been inconsonance with .the swing of the leversv 12 and fixedV Vso that the,pins 33 cannot drop andcause `described and the pin 33 drops so that itsHro]ect1onA 42 .enters the slot 37 of Athe right' angular relation tothe appropriate lever 12 or. 17, owing tothe factV that there has beennothing to dlsturb this relative positioning of the levers; As soon asthe right handl lever 39 is arrested, however, the-relationis upset forthe levers 12 and 17 continue to swing under the actionof the drivingmeans 'I above described.` Thus, the rodil will be moved over the rod41, the enlargements of the rack levers 21 and 22 will be forciblybrought a lever 39 vv levers 27 and 28 will be moved away from the pin43 of the right hand lever 39. The result will be that the levers 21 and22 will ainst the pin l43 of the left hand be spread to the positionseen in Figure 2 so that theirl racksno longer mesh with the ratchetwheel 26, whereas the levers 27 ald y 28 will be drawn towards ,oneanother ilst the enlargements of the rack 'A i their spring so that..they will mesh with theratchet wheel 32 *The right hand spool willnow-wind on ribbon whilst ribbonr'will be freely unwound from the lefthand spool.

Immediately the lever arm 36 of the right handspool isilapped by theribbon it will be forced back through its slot and will.lift

its pin 33' and re ease `the latter from the slot f3.7 of the right handlever 39, the parts being now free to swing and feed ribbon onto theright hand spool until the latter is. full and the left hand spoolis'empty,4 as will be readily understood. I r l The direction of windingand the reversal are lindicated bya pin 44 onthe jecting through a slot45 -in the rod 16. As

-will be seen by comparing 4Figures 1 and 2,

' the pin 44 lies to the left hand end of the slot 1 45 lwhen the lefthandv spool is win 'nge on and to the right hand end of the slot 45 whenthe right hand s ool'is winding on..

Having thus escribedmy invention whatl Iclairnisz W Q 'i 1. Reversibleribbon feeding mechanism for typewriting and like machines, comprising aribbonv spool, a pin Vaxially slidable' in said- I spool, meanspermitting the pinv .to dro when the ribbon is unwound from the spoo areciprocating rod, :drive gearing.v for'said spool including feed leverspivoted to Vsaid drive lever, and

means controlled by the dropping of said pin for throwing said drivegearing in'to gear,

12s a drive leverdriven by said, I l reciprocating vrod and a pa1r oftong-likel said means including an oscillating reversing lever having aslot adapted to receive sai pin whereby the oscillation of saidreversing lever is limited, and a second reciprocat- 5 ing rod adaptedto actuate said reversing lever. r

2. Mechanism as specified in claim 1, wherein the drive lever and theoscillating lever are mounted on a common pivot.

3. Mechanism as specied in claim 1, wherein the second reciprocating-rodis slidably mounted within the first mentioned reciprocating rod.

4. Mechanism as specified in claim 1, wherein the drive lever and theoscillating lever are mounted on a common pivot, an

the second reciprocating rod is slidablymounted within the vfirstmentioned recip- J rocating rod. Y

In testimony whereof I afix my signature.

' eo'rTLoB AICHELE.

